Ifr, Hell Dredger

At the beginning of your upkeep return a creature
at random from your graveyard to the battlefield.
Then you may pay {r}. If you do, choose an instant
or sorcery card at random from your graveyard. If
you control a creature with mana value equal to that
card's, you may cast it without paying its mana cost.

{x}{r}{t}, Discard a card: Reveal the top X cards of
your library. Put each revealed card with the same
mana value as the discarded card into your hand.
Put the rest into your graveyar